docs/flow.py

@@ -166,7 +166,7 @@ events = {
     "EventBadAC":       "Poll of mains reports bad AC voltage",
     "EventBatteryWarn": "Poll of BMS reports Time ToEmpty <= ShutdownTime + WarningTime",
     "EventBatteryLow":  "Poll of BMS reports TimeToEmpty <= ShutdownTime",
-    "EventHostOff":     "Poll of host load sensor shows no current draw",
+    "EventHostOff":     "Poll of host load sensor shows current draw less than threshold",
     "EventUnreachable": "Code cannot reach this event",
     }
 
@@ -189,7 +189,8 @@ MAINSOFF = production("MainsOff",
                       alarm="DOWN")
 MAINSDROP = production("MainsDrop",
                        trigger="EventBadAC",
-                       meaning="Mains power has dropped")
+                       meaning="Mains power has dropped",
+                       alarm="DOWN")
 RESTORED = production("Restored",
                       trigger="EventGoodAC",
                       meaning="Power is restored",
@@ -239,7 +240,7 @@ if __name__ == '__main__':
     render.state("OnBattery", "On battery power")
     render.action("MainsUp", "OnBattery", MAINSDROP)
     render.action("OnBattery", "Overtime", DWELLWARNING)
-    render.state("Overtime", "User warned of shutdown")
+    render.state("Overtime", "User warned of upcoming shutdown")
     render.action("Overtime", "PreShutdown", DWELLTIMEOUT)
     render.state("PreShutdown", "Awaiting power drop")
     render.action("PreShutdown", "ChargeWait", RESTORED)

docs/transactions.adoc

@@ -110,6 +110,7 @@ These policy parameters control the state transitions:
 | Parameter          | Default  | Meaning
 | ShutdownTime       | 30 sec	| Time required for host shutdown
 | WarningTime        | 60 sec	| Desired warning margin before shutdown
+| HostDrainThreshold | 10V      | Lowest expected draw of shut down host.
 |========================================================================
 
 In the following state diagram, ovals are are possible values of a

src/upsided/upsided.go

@@ -28,6 +28,7 @@ type policyConfig struct {
 	WarningTime time.Duration
 	QuietTime time.Duration
 	VoltageThreshold float32
+	HostDrainThreshold int
 	HostPair int
 	MasterSlaves [][]string
 	PowerButton uint
@@ -116,6 +117,7 @@ func init() {
 	PolicyConfiguration = policyConfig{
 		ShutdownTime: 30 * time.Second,	// Time required for host shutdown
 		WarningTime: 60 * time.Second,	// Desired warning margin before shutdown
+		HostDrainThreshold: 10,
 		QuietTime: 10 * time.Millisecond,
 		VoltageThreshold: 0.90,
 		HostPair: 1,
@@ -309,7 +311,7 @@ func fireEvents(prev *Observables, ob *Observables) {
 	hostSensor := PolicyConfiguration.HostSensor()
 	nv := ob.LoadMap[hostSensor]
 	ov := prev.LoadMap[hostSensor]
-	if ov != 0 && nv == 0 {
+	if ov >= PolicyConfiguration.HostDrainThreshold && nv < PolicyConfiguration.HostDrainThreshold {
 		Transition(EventHostOff)
 	}